US3772794A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Borehole measuring device
Assignee: Ireco Inc
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Filing: 1971-12-22
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Granted: 1973-11-20
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Expires: 1991-12-22
Abstract
Abstract A device for measuring cross-sectional dimension of a borehole including AN ELONGATED SHELL (FOR UPWARD POSITIONING) AND A PLURALITY OF DOWNWARDLY EXTENDING AND SPACED-APART ARMS PIVOTALLY ATTACHED AT THEIR UPPER ENDS TO A LOWER END PORTION OF THE SHELL; A SHAFT EXTENDING LONGITUDINALLY THROUGH THE SHELL, AND A SOLID MEMBER, GENERALLY DISC-LIKE, ATTACHED TO THE BOTTOM END OF THE SHAFT WITHIN THE CONFINES OF THE ARMS TO CAUSE THE ARMS TO PIVOTALLY RIDE ALONG THE PERIPHERY THEREOF WHEN THE SHAFT IS RAISED; A CABLE ATTACHED TO AN UPPER END OF THE SHAFT FOR RAISING IT, AND ASSOCIATED ELEMENTS FOR MEASURING THE LONGITUDINAL TRAVEL OF THE CABLE (WHEN TAUT) AS AN INDEX OF PIVOTAL TRAVEL OF THE ARMS, THE LATTER BEING A MEASURE OF THE BOREHOLE DIMENSION AT THAT LEVEL.
Inventors
- 👤 R Hopler
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 20:36
CPC Classifications
E; E21; E21B; E21B47/00; E21B47/08
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
262 words
A device for measurement of transverse cross-sectional dimension of a borehole, which comprises an elongated shell for upright positioning, open at each of the upper and lower ends, and adapted for attachment of suspension cable means to an upper end portion thereof; a plurality of spaced apart equi-length arm members pivotally attached to a lower end portion of said shell within substantially a common plane perpendicular to the longitudinal axis of said shell, and extending downwardly from said shell; a rigid shaft, longer than, and extending longitudinally through, said shell, and longitudinally movable within said shell; stop means for preventing longitudinal ingress of each end of said shaft into said shell; a solid piece member attached to said shaft below said shell and facing said shell from within the confines of said arms, and extending laterally from said shaft beyond the locus of the pivot points of said arms, whereby said arms rest against the solid piece member at outer points thereon and said shaft is longitudinally movable to cause said solid piece member to move along adjacent arm surfaces to in turn cause said arms to pivotally travel about said pivot points; suspension cable means attached to said shaft for raising same longitudinally with respect to said shell; signal means for indicating when the last Said suspension cable means is initially taut for longitudinally raising said shaft with respect to said shell; and means for measuring longitudinal distance of upward travel of the last said cable means when taut, as an index of lateral distance of pivot travel of said arms.
Claim 2
Independent Claim
262 words
A device for measurement of transverse cross-sectional dimension of a borehole, which comprises an elongated shell for upright positioning, open at each of the upper and lower ends, and adapted for attachment of suspension cable means to an upper end portion thereof; a plurality of spaced apart equi-length arm members pivotally attached to a lower end portion of said shell within substantially a common plane perpendicular to the longitudinal axis of said shell, and extending downwardly from said shell; a rigid shaft, longer than, and extending longitudinally through, said shell, and longitudinally movable within said shell; stop means for preventing longitudinal ingress of each end of said shaft into said shell; a solid piece member attached to said shaft below said shell and facing said shell from within the confines of said arms, and extending laterally from said shaft beyond the locus of the pivot points of said arms, whereby said arms rest against the solid piece member at outer points thereon and said shaft is longitudinally movable to cause said solid piece member to move along adjacent arm surfaces to in turn cause said arms to pivotally travel about said pivot points; suspension cable means attached to said shaft for raising same longitudinally with respect to said shell; signal means for indicating when the last Said suspension cable means is initially taut for longitudinally raising said shaft with respect to said shell; and means for measuring longitudinal distance of upward travel of the last said cable means when taut, as an index of lateral distance of pivot travel of said arms.
Claim 3
Dependent Claim
27 words
Apparatus of claim 1 including suspension cable means attached to said shell for suspension of said device to lower, and raise, same into and from said borehole.
Claim 4
Dependent Claim
24 words
A device of claim 1 wherein said shaft and said shell are disposed in slidably splined relationship so as to preclude separate rotations thereof.
Claim 5
Dependent Claim
31 words
A device of claim 3 wherein said shell and said shaft constitute concentric pipe members, and a pipe cap threaded to each end of said shaft comprise said stop means therefor.
Claim 6
Dependent Claim
83 words
A device of claim 4 further comprising a permanent magnet secured to a non-ingressing end portion of said shaft into said shell, a magnetic reed switch secured to the end of said shell adjacent said magnet, and an electric circuit, including said reed switch, adapted to close when said magnet is disposed adjacent thereto, and to open in response to longitudinal travel of said magnet away from said switch; and means for indicating when said circuit is closed and when it is open.
Claim 7
Dependent Claim
41 words
A device of claim 5 further comprising a filament type pilot light in said circuit adapted to burn when said circuit is closed and to not burn when said circuit is open in response to said longitudinal travel of said magnet.
Claim 8
Dependent Claim
18 words
A device of claim 3 wherein said solid piece comprises a disc member coaxially supported on said shaft.
Claim 9
Dependent Claim
65 words
A device of claim 7 containing a total of three of said arm members substantially equi-distantly spaced about the periphery of said shell member and pivotally attached to the lower end of said shell; and each said arm member adapted to swing from, and then retract toward, the extended longitudinal axis of said shell about its pivot point in a plane containing said extended axis.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-11-19 | 1977-05-21 | 1977-11-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-11-19 | 1981-05-21 | 1981-11-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-11-19 | 1985-05-21 | 1985-11-20 | $7700.00 | Window Closed / Lapsed |